linux-kernel - Re: [RFC 5/6] x86, NMI, Add support to notify hardware error with unknown NMI

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Date:	Tue, 14 Sep 2010 09:48:13 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Valdis.Kletnieks@...edu
Cc:	Don Zickus <dzickus@...hat.com>, Huang Ying <ying.huang@...el.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 5/6] x86, NMI, Add support to notify hardware error with
 unknown NMI

On Mon, 13 Sep 2010 17:25:21 -0400
Valdis.Kletnieks@...edu wrote:

> > Practically every PC has a small amount of NVRAM.
> 
> The big question is how much NVRAM the PC has that is safe for our
> NMI code to hijack/borrow across the reboot without scrogging
> something that the BIOS has squirreled away in there. I recall one
> patch that saved progress indicators during early boot or something -
> but at the expense of stomping on the saved clock settings or
> whatever so you rebooted and then you knew where your previos boot
> wedged, but your system thought it was 1970 again. 

It's already implemented for MCE and it works on servers.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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